The hypothesis that sending blood-stained cerebrospinal¯uid (CSF) through a pneumatic tube causes in vitro haemolysis has been tested. Spectrophotometric scanning of CSF supernatants demonstrated a signi®cantly greater absorbance at 415 nm in those CSF samples that had been sent through the tube system compared to those that had not (P=0´0034). It is concluded that passage of blood-stained CSF down a pneumatic tube system causes in vitro haemolysis, accompanied by the release of oxyhaemoglobin from the lysed cells into the surrounding CSF. In view of this observation, it is recommended that CSF samples requiring spectrophotometric analysis, as part of the investigation of subarachnoid haemorrhage, should not be transported via a pneumatic tube system.

No abstract

SUMMARY Among 295 cases of Hodgkin's disease seen at the Peter MacCallum Clinic between 1952 and 1962 there were 37 cases considered to be nodular sclerosing Hodgkin's. This sub‐type has a characteristic pathological appearance and certain clinical features including a good prognosis that merit separating this type from the main group of Hodgkin's granuloma cases.

after a referral from the primary veterinarian for a suspected gallbladder mucocele. The clinical history included 3 weeks of intermittent anorexia, vomiting, and melena; the referring veterinarian identified a gallbladder mass on abdominal ultrasound. A complete blood count revealed a mild mature neutrophilia with a left shift, mild toxic change, and lymphopenia, interpreted as an inflammatory leukogram. Serum chemistry and liver function testing

SUMMARY Pathological classification in the group of malignant lymphomas has changed over the past 20 years. The modern classifications of both the Hodgkin's and non‐Hodgkin's lymphomas are presented, together with some relevant historical background. Attention is drawn to the remarkable increase in the incidence of nodular sclerosing Hodgkin's disease in the past ten years, an increase which appears due to changing histological criteria alone, rather than an absolute increase in Hodgkin's disease in general.